185’s are a little on the small side for a 351w even . 10 psi on a stock bottom end 351 can make 600 relatively easily. The single plane style intakes made for efi like John has and I run on my combo really let these things breathe . My friends 351w stock bottom end with a 70mm turbo made 636 on 8psi. If your budget can swing some 205’s I’d go that route . I’m doing a 393 over winter with super victor efi intake 10-1 compression , ported victor jr 210cc heads, Anderson b451 and reusing my procharger d1sc . I won’t be surprised if it makes 700 on only 10psi . I plan on running 15psi .